White Daydreams 2 (1987)

One day, the young man, Kuracishi Junji, met a beautiful woman named Yashiro Chieko at a dental clinic. They went together to receive treatment, and Junji received an injection of anesthesia. But in his fading consciousness, what he saw was Chieko being tortured by Dr. Ryū. In the disco, in the hotel, Dr. Ryū raped and tortured Chieko. Although Chieko hated Dr. Ryū, she couldn’t help but cry out in joy. Junji could only watch helplessly as Chieko was tortured by Dr. Ryū. In his frustration, Junji decided to use a knife to hurt Chieko.